基于H.264低比特率视频流的半脆弱盲水印算法实现

本文提出一种基于H.264低比特率视频流的半脆弱盲水印方法,通过在H.264特有的的帧内预测和运动向量预测中分别嵌入鲁棒水印和脆弱水印,达到版权保护和内容完整性认证的双重目的.通过在嵌入强度和预测模式选择的拉格朗日乘子中引入H.264量化因子,增强了水印对重量化编码的抵抗力,取得更好的率失真平衡,减小水印嵌入对视频流比特率的影响.该算法可以实现水印的快速嵌入提取,满足视频实时处理的要求,实验结果证明了该算法的有效性.

Implement of Semi-fragile Blind Watermark Algorithm for H.264 Low Bit-Rates Video Stream

A novel semi-fragile blind watermark algorithm based on H.264 low bit-rate video stream was proposed in this paper,copyright protection and content authentication can be achieved jointly by embedding the robust watermark and fragile watermark spectively during the process of interior prediction and motion vector prediction which are characteristic for H.264 standard. Through introducing the quantization factor of H.264 in the embedding and prediction mode choice,the proposed scheme can strengthen the watermarking resistance to video recoding and strike a good ratedistortion balance for the watermark of lower bit-rate video stream, which relieve bit-rates lossness from the watermarking embedding. Experimental results also demonstrate that this scheme is very computational efficient during watermarking embedding and extraction.